clippy: fix warning from needless_doctest_main

[cakebaker]

This PR fixes a warning from the needless_doctest_main lint.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.32%. Comparing base (8fcc220) to head (6efd413).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #94   +/-   ##
=======================================
  Coverage   93.32%   93.32%           
=======================================
  Files           4        4           
  Lines         734      734           
=======================================
  Hits          685      685           
  Misses         49       49           

Flag	Coverage Δ
macos_latest	99.15% <ø> (ø)
ubuntu_latest	99.18% <ø> (ø)
windows_latest	92.59% <100.00%> (ø)

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